EP3105870A1 - Datenübertragungsverfahren - Google Patents

Datenübertragungsverfahren

Info

Publication number
EP3105870A1
EP3105870A1 EP15749378.4A EP15749378A EP3105870A1 EP 3105870 A1 EP3105870 A1 EP 3105870A1 EP 15749378 A EP15749378 A EP 15749378A EP 3105870 A1 EP3105870 A1 EP 3105870A1
Authority
EP
European Patent Office
Prior art keywords
data signal
signal
management data
recovered
management
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15749378.4A
Other languages
English (en)
French (fr)
Other versions
EP3105870A4 (de
EP3105870B1 (de
Inventor
Gunnar Forsberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Transmode Systems AB
Original Assignee
Transmode Systems AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Transmode Systems AB filed Critical Transmode Systems AB
Publication of EP3105870A1 publication Critical patent/EP3105870A1/de
Publication of EP3105870A4 publication Critical patent/EP3105870A4/de
Application granted granted Critical
Publication of EP3105870B1 publication Critical patent/EP3105870B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/697—Arrangements for reducing noise and distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/524—Pulse modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/54—Intensity modulation
    • H04B10/541—Digital intensity or amplitude modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/074—Monitoring an optical transmission system using a supervisory signal using a superposed, over-modulated signal

Definitions

  • the present disclosure relates to methods and devices for transmitting data.
  • the present disclosure relates to methods and devices for transmitting traffic data together with management data.
  • Signals sent over optical fibers consist of sequences of binary ones and zeroes.
  • a common modulation used for transmission of the binary sequences is NRZ (Non-return Zero) line code.
  • NRZ Non-return Zero
  • binary ones are transmitted using one physical condition and binary zeroes are transmitted using another physical condition.
  • light pulses are used to transmit the data.
  • a typical NRZ line code a light pulse sent by a laser signals a binary one whereas a weaker or no light pulse signals a binary zero.
  • the management channel can be used to transmit various commands and settings through the system or be used to upgrade software.
  • the management channel can typically be implemented by inserting management channel frames in the data channel. Another way is to send the management data on a separate channel.
  • the international patent application WO 84/01679 describes a transmission system where an information channel is added to the traffic signal by means of pulse width modulation.
  • the information channel can for example be used to transmit a voice signal.
  • the management data will require additional bandwidth. For example if management data frames are inserted in the data channel latency will be introduced and data on the data channel will be delayed. On the other hand if the management channel is sent over a separate channel, there will be a cost for that separate channel.
  • the noise introduced by the traffic on the data channel, such as NRZ encoded data has to be filtered out in the receiver with a low pass filter.
  • the bandwidth of the low pass filter in the receiver sets a limit to the rate at which the superimposed management data can be detected in the receiver. In a system with much noise the low pass filter has to have a low bandwidth. The bandwidth sets a limit to the data rate that can be superimposed.
  • the receiver can be provided with a module for cancelling the noise using the recovered received NRZ bit sequence.
  • the recovered NRZ bit sequence is added in anti-phase to the received bit sequence. Stated differently the recovered NRZ bit sequence is subtracted from the received bit sequence. This operation will to a large extent cancel the noise introduced by the transmitted data signal.
  • the management data can then be recovered from a signal with significantly reduced noise. Hereby it is possible to increase the data rate of the management data signal and still be able to recover the management data signal at the receiver despite the noise introduced by the NRZ data signal.
  • the received bit sequence and the recovered NRZ bit sequence can in an advantageous implementation be low-pass filtered before the sequences are added.
  • a method of receiving a management data signal in an optical transmission system where a traffic data signal is received as a NRZ modulated signal is provided.
  • the traffic data signal has the management data signal superimposed thereon as a pulse width modulation of the symbols of the NRZ modulated signal.
  • the NRZ modulated signal with the data signal superimposed thereon is received as a first signal.
  • the traffic data signal from the first signal is recovered in anti-phase.
  • the recovered traffic data signal in anti-phase is added to the received first signal, forming a second signal.
  • the received signals are advantageously low-pass filtered.
  • the signals to be added are low- pass filtered or the second signal is low-pass filtered.
  • the management data signal from the second signal is detected as a detected management data signal.
  • the recovered data signal in anti-phase and the first data signal are low-pass filtered before being added.
  • the low-pass filter is adapted to attenuate frequencies above the frequency at which the management data signal is transmitted.
  • the recovered data signal in anti-phase and the first data signal are amplified before being added.
  • the management data signal is recovered from the detected management data signal. In accordance with one embodiment, when the
  • management data signal is encoded, the recovered management data signal is decoded to output the management data signal.
  • the invention also extends to a receiver and to a transmission system adapted to implement the methods as described herein.
  • - Fig. 1 is a general view of a transmission system
  • - Fig. 2 is a view of a transmitter
  • - Fig. 3 is a view of a receiver
  • Fig. 4 is a flowchart illustrating some steps performed when receiving a data signal.
  • a view of a transmission system 100 is shown.
  • the system comprises a transmitter 102 and a receiver 104.
  • the transmitter 102 transmits data from the transmitter to the receiver 104.
  • the channel between the transmitter and the receiver can be an optical fiber line.
  • the transmitter 102 can for example be associated with a radio base station that transmits data to a receiver 104 associated with an access network over the optical fiber line.
  • Traffic data on the optical line can be transmitted using a laser transmitting the data in accordance with a NRZ modulating scheme.
  • management data can be
  • the management channel can for example be implemented by superimposing data by pulse width modulation of a management data signal.
  • the pulse width modulation results in that a rising edge of a NRZ signal is time shifted to the left in a time diagram, and a falling edge is time shifted to the right with the same number of pico seconds and vice versa.
  • the pulse width modulation of the NRZ signal thus enables an inclusion of a management channel superimposed to the NRZ signal.
  • only one of the falling / rising edges can be time- shifted to add the data of the management channel.
  • the falling /rising edges are shifted in other ways.
  • the information on the management channel is transmitted by transmitting symbols that are wider and narrower.
  • the management data signal By transmitting a management data signal as modulation of the pulse width of an optical NRZ signal, the management data signal can be recovered at the receiver as a pulse sequence of wider and narrower light pulses.
  • the management data can in some embodiments be encoded using some code, in particular a code that provides a DC-balancing of the symbols, such as a biphase code or a Manchester code to improve the data transmission.
  • a code that provides a DC-balancing of the symbols such as a biphase code or a Manchester code to improve the data transmission.
  • a DC balanced code the number of transmitted binary ones and binary zeroes are equaled. Coding using a DC balancing code is particularly useful if the management data signal is unbalanced, i.e.
  • the different pulse widths of the NRZ signal represents the management data.
  • a number of consecutive symbols in the traffic data sequence are variably time increased and decreased to represent the bit sequence of the management data channel.
  • the data rate on the management data channel is
  • the management data signal can be superimposed on any traffic data signal.
  • the traffic data signal can have a bit rate of 125 Mbit/s up to 12.5 Gbit/s or higher.
  • the traffic data signal can for example be transmitted on a Gigabit Ethernet (GbE) having a rate, after 8B/10B encoding, of 1250 Mbit/s and the management data signal can then be superimposed on the traffic data signal of the GbE.
  • GbE Gigabit Ethernet
  • a transmitter 102 for generating a NRZ data signal having a pulse width modulated management data signal superimposed thereon comprises a first input terminal 201 to receive an NRZ data signal.
  • the transmitter further comprises a second input terminal 203 to receive a management data signal.
  • the management data signal can typically be encoded in an encoder 205 for example using a biphase code and is clocked at a rate lower than the NRZ data signal.
  • the management data signal is clocked at a rate that is only a small fraction of the rate of the NRZ data signal such as 1/100 or 1/1000 of the rate of the NRZ signal.
  • the transmitter further comprises a pulse width modulator 207 that pulse width modulates the NRZ signal using the management data signal.
  • the NRZ signal is scrambled to ensure that there are enough falling and rising edges of the pulse train of the NRZ signal during one symbol of the management data signal.
  • the pulse width modulated, possibly scrambled, NRZ signal is transmitted over an optical fiber line using a suitable device such as a transceiver 209.
  • a receiver 104 for receiving a management data signal is depicted.
  • the receiver is adapted to recover a management data signal in an optical transmission system where a traffic data signal is transmitted as a NRZ modulated signal.
  • the traffic data signal has a management data signal superimposed thereon as a pulse width modulation of the symbols of the NRZ modulated signal.
  • the signal received can for example be generated using a transmitter 102 as described above in conjunction with Fig. 2.
  • the receiver 104 comprises a module 303 such as a transceiver for receiving the signal over an optical fiber line.
  • the module 303 is adapted to output a first signal as the NRZ modulated signal with the data signal superimposed thereon.
  • the receiver 104 comprises a clock and data recovery module 307 for recovering the traffic data signal from first signal output from the module 303. It is to be noted that the difference between the received signal and the recovered signal from module 307 is that the recovered signal from block 307 is also recovered with regard to timing. Hence, the signal before the CDR is 2R (re-amplified, and reshaped) whereas the signal after the CDR is 3R (re-amplified, reshaped, and retimed).
  • the module 307 can further be adapted to output the recovered traffic data signal in anti-phase.
  • the receiver 104 is adapted to add the recovered traffic data signal in anti-phase to the received first signal, forming a second signal in an adder 309.
  • the recovered traffic data signal is subtracted from the received NRZ modulated signal.
  • the received signals are low-pass filtered.
  • the NRZ modulated signal and the recovered traffic data in anti-phase are low-pass filtered and possibly amplified in module(s) 311 before being added in the adder 309.
  • the output signal from the adder is low-pass filtered.
  • the adding of the first signal and the anti-phase signal will cancel or at least significantly reduce the noise introduced in the management data signal by the NRZ modulated signal.
  • the second signal is detected using a detector 313 connected to the output of the adder 309 as the management data signal.
  • the detector 313 can for example be implemented using a comparator, a decision circuit, slicer, limiter etc.
  • the detector can use any reference DC voltage.
  • the reference DC voltage is ground as illustrated in Fig. 3.
  • the low-pass filtering in modules 311 can be tuned to the rate of the transmitted
  • the low-pass filter can attenuate frequencies above 300 kHz.
  • the receiver in Fig. 3 can be supplemented with a clock and data recovery circuit 315 to recover the management data signal.
  • the management data signal is encoded, for example using a biphase code
  • the recovered management data signal must be decoded using a decoder 317 to output the management data signal.
  • a biphase decoder is provided to generate the management data output signal.
  • the input signal to the modules 311 should have an essentially equal peak-to -peak amplitude. It is not desired to have large difference, for example more than 10 - 20%, in peak-to-peak amplitude difference.
  • the receiver in Fig. 3 can be designed as follows. If the module 303 is an SFP transceiver, there is a risk of unbalanced peak-to peak amplitude input signals to the modules 311 if the SFP transceiver is exchanged. This problem can be solved by providing a buffer circuit on the path from the module 303 to the corresponding module 311. The buffer circuit is designed to generate a constant peak-to-peak output signal regardless of the performance of the module 303. In accordance with some embodiments the receiver is trimmed with regard to the peak-to-peak amplitude input signal difference to the modules 311 before being used. This will ensure a good performance. Fig.
  • a signal on an optical fiber line is received.
  • the received signal comprises a traffic data signal transmitted as a RZ modulated signal.
  • the traffic data signal has a management data signal superimposed thereon as a pulse width modulation of the symbols of the NRZ modulated traffic data signal.
  • the traffic data signal in anti-phase is recovered from the signal received in step 401.
  • the signal generated in steps 40 land 403 are low-pass filtered and possibly amplified.
  • the signals generated in steps 401 and 403, possibly low-pass filtered and amplified, are then added in a step 407.
  • the output signal generated in step 407 is then detected in a step 409 and can be used to recover the management data signal.
  • the signal detected in step 409 can be recovered using a clock and data recovery circuit in a step 411.
  • the management data signal is not encoded the signal generated in step 411 is the transmitted management data signal.
  • the transmitted management data signal is encoded, the output in step 411 will be the coded management data signal.
  • the output from step 411 is an encoded management data signal
  • the output from step 411 can be decoded in a step 413 using a corresponding decoder.
  • a biphase decoder can be used to decode the management data signal in step 413.
  • MNR Modulation to Noise Ratio
  • y duty cycle modulation, e.g. 60ps corresponding to a value 60 * 10 A -12 above.
  • Fb bit rate for the traffic data, e.g. 622.08Mbit/s corresponding to a value 622.08 * 10 A 6 above (this is the bitrate for the protocol, STM-4)
  • BW the bandwidth of the analogue filter used e.g. 200 kHz corresponding to 200 * 10 A 3 above.
  • MNR is then 14.72. This corresponds to a BER below 10 A -9, which is typically a good value that ensures a correct transmission.
  • Using the method and receiver as described herein will provide a transmission system where a management data signal can be transmitted simultaneously as a traffic data signal without the need for additional bandwidth. Further, the transmission rate of the management data signal can be high enough to meet the need for transmission rate in systems using a management transmission data channel.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Optical Communication System (AREA)
EP15749378.4A 2014-02-13 2015-02-13 Datenübertragungsverfahren Active EP3105870B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1450166 2014-02-13
PCT/SE2015/050171 WO2015122836A1 (en) 2014-02-13 2015-02-13 Data transmission method

Publications (3)

Publication Number Publication Date
EP3105870A1 true EP3105870A1 (de) 2016-12-21
EP3105870A4 EP3105870A4 (de) 2017-10-04
EP3105870B1 EP3105870B1 (de) 2019-01-16

Family

ID=53801758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15749378.4A Active EP3105870B1 (de) 2014-02-13 2015-02-13 Datenübertragungsverfahren

Country Status (3)

Country Link
US (1) US9735889B2 (de)
EP (1) EP3105870B1 (de)
WO (1) WO2015122836A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3076414B1 (fr) * 2017-12-28 2020-11-06 Thales Sa Systeme de communications de donnees comportant un canal principal haut debit et un canal de secours bas debit a haute fiabilite
US11221644B2 (en) * 2018-05-21 2022-01-11 Samsung Electronics Co., Ltd. System for transceiving data based on clock transition time
US20200256954A1 (en) * 2019-02-07 2020-08-13 Analog Devices, Inc. Optical pulse coding in a lidar system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE432859B (sv) * 1982-10-22 1984-04-16 Ericsson Telefon Ab L M Forfarande att overfora en extra informationskanal over ett transmissionsmedium
DE3530546A1 (de) * 1985-08-27 1987-03-19 Ant Nachrichtentech Uebertragungsverfahren fuer schnellen und langsamen datenstrom
US6295272B1 (en) * 1998-04-20 2001-09-25 Gadzoox Networks, Inc. Subchannel modulation scheme for carrying management and control data outside the regular data channel
US20030043437A1 (en) * 2001-09-04 2003-03-06 Stough Stephen A. Subliminal coherent phase shift keyed in-band signaling of network management information in wavelength division multiplexed fiber optic networks
SE525926C2 (sv) * 2003-05-28 2005-05-31 Transmode Systems Ab Förfarande för överföring av driftinformation i ett WDM-system
US8032021B2 (en) * 2007-02-28 2011-10-04 Finisar Corporation Status link for multi-channel optical communication systems
US20090116847A1 (en) * 2007-11-05 2009-05-07 Xiaodong Duan Optical transceiver with in-band management channel
US20120288274A1 (en) * 2011-05-15 2012-11-15 Wen Li Optical network system and devices enabling data, diagnosis, and management communications

Also Published As

Publication number Publication date
EP3105870A4 (de) 2017-10-04
EP3105870B1 (de) 2019-01-16
US20160352434A1 (en) 2016-12-01
US9735889B2 (en) 2017-08-15
WO2015122836A1 (en) 2015-08-20

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